A non-isothermal model was developed including viscoplastic deformation, phase transformations and their interactions. The model was applied to a 12% chromium steel for temperatures between RT and 1600K. Austenite transformation, martensite transformation and the constitution of carbides were identified to affect the mechanical behaviour of the martensitic steel investigated. A generalized Johnson-Mehl-Avrami equation and the Koistinen-Marburger equation were used to describe these phase transformations. Viscoplastic deformations were modelled with an isothermal Chaboche-type model which was extended to non-isothermal conditions. Tensile, cyclic and relaxation test data were used to identify the model parameters.


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    Title :

    Description of the material behaviour in girth welds during weld fabrication and for high temperature service


    Contributors:


    Publication date :

    2002


    Size :

    10 Seiten, 4 Bilder, 13 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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